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r = 21/2
r = 10,5 cm
sudut AOB siku² = 90°
Luas juring AOB = 90°/360° x π x r²
= 1/4 x 22/7 x 10,5 x 10,5
= 22/28 x 110,25
= 11/14 x 110,25
= 1.212,75/4
= 86,625 cm²
Luas ∆ AOB = r²/2
= 10,5²/2
= 110,25/2
= 55,125 cm²
Luas tembereng AB
= Luas juring - Luas ∆
= 86,625 - 55,125
= 31,5 cm²